More gain = more noise.
Power amplifiers usually have fixed gain, about 20x, or 26 dB. They need this to translate the input voltages (often around 1-2 V) to the speaker voltages.
They may have adjustment pots in the input, but the gain of the circuit itself is fixed.
Power amplifiers usually have fixed gain, about 20x, or 26 dB. They need this to translate the input voltages (often around 1-2 V) to the speaker voltages.
They may have adjustment pots in the input, but the gain of the circuit itself is fixed.